Introduction to parallel algorithms and architectures: array, trees, hypercubes
Introduction to parallel algorithms and architectures: array, trees, hypercubes
Optimal algorithms for broadcast and gossip in the edge-disjoint path modes
Information and Computation
On Ádám's conjecture for circulant graphs
Discrete Mathematics
Discrete Applied Mathematics - Special issue: network communications broadcasting and gossiping
An LLL Algorithm with Quadratic Complexity
SIAM Journal on Computing
The LLL Algorithm: Survey and Applications
The LLL Algorithm: Survey and Applications
On routing in circulant graphs
COCOON'99 Proceedings of the 5th annual international conference on Computing and combinatorics
Proceedings of the forty-second ACM symposium on Theory of computing
Faster exponential time algorithms for the shortest vector problem
SODA '10 Proceedings of the twenty-first annual ACM-SIAM symposium on Discrete Algorithms
Many random walks are faster than one
Combinatorics, Probability and Computing
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Using number theoretical tools, we prove two main results for random r-regular circulant graphs with n vertices, when n is sufficiently large and r is fixed. First, for any fixed ε0, prime n and L≥n1/r (logn)1+1/r+ε, walks of length at most L terminate at every vertex with asymptotically the same probability. Second, for any n, there is a polynomial time algorithm to find a vertex bisector and an edge bisector, both of size less than n1−1/r+o(1). As circulant graphs are popular network topologies in distributed computing, we show that our results can be exploited for various information dissemination schemes. In particular, we provide lower bounds on the number of rounds required by any gossiping algorithms for any n. This settles an open question in an earlier work of the authors (2004) and shows that the generic gossiping algorithms of that work are nearly optimal.